(1) The Secretariat is authorized to administer arbitration and conciliation proceedings for the settlement of legal disputes arising out of an investment between a State or an REIO on the one hand, and a national of another State on the other hand, which the parties consent in writing to submit to the Centre if:
(a) none of the parties to the dispute is a Contracting State or a national of a Contracting State;
(b) either the State party to the dispute, or the State whose national is a party to the dispute, but not both, is a Contracting State; or
(c) an REIO is a party to the dispute.
(2) Reference to a State or an REIO includes a constituent subdivision of the State, or an agency of the State or the REIO. The State or the REIO must approve the consent of the constituent subdivision or agency which is a party to the proceeding pursuant to paragraph (1), unless the State or the REIO concerned notifies the Centre that no such approval is required.
(3) Arbitration and conciliation proceedings under these Rules shall be conducted in accordance with the ICSID Additional Facility Arbitration Rules or the ICSID Additional Facility Conciliation Rules respectively. The ICSID Additional Facility Administrative and Financial Regulations shall apply to such proceedings.